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jsspace 发表于 2014-7-2 10:56 5 l' L' V& f" ?0 U( r: i
次级不能接地,这个在61347-2-13上已经明确说明了 . `% v2 a6 P% n, D# C) E3 ?
依据IEC61347-2-13 Clause 8.2, 满足条件的SELV都可以被人接触到,为什么不可以接地?
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" s% r! k& N/ Z* s$ u8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if. G/ C, X2 s6 h. H; f6 L
– the rated output voltage for constant voltage control gear or maximum output voltage for
* T# b* V7 s* p- M P Fconstant current control gear under load does not exceed 25 V r.m.s.;1 t7 L9 P& H/ ]2 W* ~
– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed% U% V% @: L6 L6 z8 X+ S, [
33 2 V.
8 r4 s. }; ~; F* ?) @8 c( ]Compliance is checked by measuring the output voltage when steady conditions are8 m7 K) A5 K/ g8 T
established, the controlgear being connected to rated supply voltage and rated frequency. For" c5 d9 ]1 `0 O& T& o
the test under load, the controlgear is loaded with a resistance which would give rated output3 o ~' R7 v$ ?0 Q, j* `' X1 I+ X: x
at rated output voltage.
5 L) S, T' h1 x( y) N: h; ?For controlgear with more than one rated supply voltage, the requirement is applicable for* H7 [8 J* y+ F6 P* r8 Z% ?
each of the rated supply voltages.
4 c. z0 K8 U9 IControlgear with a rated output voltage above 25 V shall have insulated terminals. |
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